//[Test]
        public void ToStringTest()
        {
            DataRelationCollection drcol = _dataset.Relations;
            DataRelation           dr1   = new DataRelation("CustOrder"
                                                            , _dataset.Tables ["Customer"].Columns ["custid"]
                                                            , _dataset.Tables ["Order"].Columns ["custid"]);

            drcol.Add(dr1);
            Assert.That(drcol.ToString(), Is.EqualTo("System.Data.DataRelationCollection"), "test#1");
            Console.WriteLine(drcol.ToString());
        }